A strip of copper and another of germanium ar | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) Copper is a metal (conductor). For metals,the resistance decreases as the temperature decreases because the collision frequency of electrons with

Vedclass · Accepted Answer

Copper strip decreases and that of germanium increases

Vedclass · Answer

(D) Copper is a metal (conductor). For metals,the resistance decreases as the temperature decreases because the collision frequency of electrons with lattice ions decreases.Germanium is a semiconductor. For semiconductors,the resistance increases as the temperature decreases because the number of charge carriers (electrons and holes) decreases exponentially with a decrease in temperature.Therefore,when cooled from room temperature to $80\, K$,the resistance of the copper strip decreases and the resistance of the germanium strip increases.

$A$ strip of copper and another of germanium are cooled from room temperature to $80\, K$. The resistance of

Similar Questions

The dimensions of resistivity in terms of $M, L, T$ and $Q$,where $Q$ stands for the dimensions of charge,is:

Two wires $A$ and $B$ of the same material and same mass have radii $2r$ and $r$,respectively. If the resistance of wire $A$ is $34\,\Omega$,then the resistance of wire $B$ will be ............ $\Omega$.

Which of the following has a negative temperature coefficient?

If the length of a wire is increased by $0.1\%$,what is the percentage increase in its resistance (in $\%$)?

In the following,$I$ refers to current and other symbols have their usual meaning. Choose the option that corresponds to the dimensions of electrical conductivity.

Vedclass Test Series

Exam Paper Generator

Online Exam Module